单选题 The latest study includes a comparison made between ______.

A、 healthy veterans and unhealthy veterans
B、 nuclear test participants and those with no radiation exposure
C、 the veterans who are still alive and those who have died
D、 people who died of cancer and people who took part in atomic tests

【正确答案】 B

【答案解析】[解析] 本题的依据句是第四段的“For comparison，researchers selected a group of 65,000 military people serving at the same time under similar conditions，except that they did not take part in nuclear tests．”，从中可知B项为正确答案。